Blast furnace tuyere



G. E. STEUDEL BLAST FURNACE TUYERE Filed Nov. 13, 1944 i=- v I Feb. 5, 1946;

,1 I III/111 III, 7 i,

INVENTOR. G golcge'EfifeudeL 'tuyere nose.

Patented Feb. 5, 1946 2,394,491 BLAST FURNACE 'rUYnaE George E. Steudel, Chicago, Ill., assignor to Carncgle-Illinols Steel Corporation, a corporation oi New Jersey Application November 13, 1944, Serial No. 563,205

Claims.

This invention relates to tuyeres and more particularly to water cooled tuyeres for use in a blast furnace.

In the operation of blast furnaces, the bottom nose end of the tuyeres are burned due to unfavorable conditions of the furnace burden which results in the formation of a dense area in line with the descent of the charge and substantially directionally below and in contact with the This dense area aided by the chilling effect of the water cooled tuyere forms a pocket and prevents the descending globules of metal at the end of the tuyre from passing through to the hearth, thus forming a pool of metal, which, when it contacts the tuyere, burns the nose end and destroys its usefulness. This condition becomes increasingly serious as the linings of the furnace become worn. In order to increase the life of the tuyere, it has been suggested that an insert of a material having a high melting point be used in the bottom side of the nose end of the tuyere. While helpful, this suggestion does not eliminate or substantially reduce the dense area, but merely decreases its ill effects.

It is an object of this invention to reduce and move back the dense area by cutting back the bottom nose end of the tuyere.

This and other objects will be more apparent after referring to the following specification and attached drawing, in which:

Figure 1 is a longitudinal section of the tuyere as placed in the cooler of a blast furnace;

Figure 2 is a front view thereof and Figure 3 is a top view.

Referring more particularly to the drawing, the reference numeral 2 indicates the part of the furnace wall surrounding a cooler l which supports a tuyere 8 in the usual manner. As is customary, the tuyere consists of a substantially frusto-conical body 8 made of a copper alloy or other appropriate material and having the usual air passage It] for the admission of a blast of air to the furnace, this passage being connected at its outer end with the source of air supply by means of a pipe l2. Surrounding the air passage in is a chamber It to which a cooling fluid is supplied by means of an inlet pipe IS. The fluid after passing through the chamber I4 is discharged from the top thereof through an ably approximately 20, but the benefits of the invention may be obtained by varying the angle between approximately 6" and Since the nose is cut back, the descending materials within the furnace have less tendency to pack at the bottom and foremost end of the tuyere, thereby increasing the porosity of the molten materials at this point with a resulting reduction of the dense area. The chilling effect of the tuyre is also farther back so that if a pocket should form at the bottom nose end, the globules of molten material, which drop past the upper front section of the tuyere, do not encounter the pocket and enlarge it, but continue to the hearth of the furnace.

While one embodiment of the invention has been shown and described, it will be apparent that other adaptations and modifications may be made without departing from the scope of the following claims.

I claim:

l. A tuyre comprising a body portion having an air passage therethrough, and an outer nose portion on said body having its face inclining downwardly and inwardly from the vicinity of the uppermost and outermost portion of the air passage.

2. A tuyere comprising a body portion having an air passage therethrough, and an outer nose portion on said body having its face inclining .downwardly and inwardly at an angle of hetween approximately 6 and 35 from the vicinity outlet pipe l8. The body 8 has an outer nose portion 20 whose face inclines downwardly and inwardly at an angle of 20 from the uppermost and outermost portion of the air passage 1 0. The inclination of the nose face prevents the accumulation of the dense molten materials which usually collects around the underside of the nose of the tuyere, thus protecting the tuyere from burning. The angle of inclination 22 is preferof the uppermost and outermost portion of the air passage.

3. A tuyere comprising a body portion having an air passage therethrough, a cooling chamber in said body surrounding said air passage, and an outer nose portion on said body having its face inclining downwardly and inwardly at an angle of between approximately 6 and 35 from the vicinity of the uppermost and outermost portion of the air passage.

. 4. A tuyere comprising a body portion having an air passage therethrough, a cooling chamber in said body surrounding said air passage, and an outer nose portion on said. body having its vface inclining downwardly and inwardly at an 

